-page structures have a field for debug flags
-These flags are useful to determine if a page is poisoned
-get debug_flags value from page structure
-page is poisoned if value is 1

Change-Id: Ieeec9ca437b3ea5e20dc0c93150a60cd99e47535

Many of the mm functions need minor tweaks to work with arm64:
- reading 32-bit ints instead of 64-bit words
- using proper page offsets
- vmemmap instead of sparsemem

Update these functions.

Change-Id: I407fdf84c64dbfed870a95fd439bef28598714cb

When calculating pfn_to_page, the pfn needs to be offset before
indexing into the array. Account for this.

Change-Id: If207447a91537ab7670058fede65473d3ea93281

Older targets use a slightly different version of map around the hole
which has different variable names. Account for this in the code.

Change-Id: Ia657b265dc6f34c9fb33f71c1ef62dbf0c0c2114

After a crash, ramdumps may be collected for analysis. The ram
parser is a tool to aid in analysis of these dumps. The script
extracts useful information from the dumps to help with debugging.
Please see the README for full details.

Change-Id: I7795686a96bbfe246edf47d09e3f616131688429